Power transmitter



March 13, 1951 SCHULDER 2,544,768

POWER TRANSMITTER Filed March 16, 1949 36FIG. I.

INVENTOR.

PAUL SCHULDER TTORNEY Patented Mar. 13, 1951 POWER TRANSMITTER PaulSchulder, Brooklyn, N. Y., assignor to Consolidated Sewing Machine &Supply 00., Inc., New York, N. Y., a corporation of New York ApplicationMarch 16, 1949, Serial No. 81,643

2 Claims.

The invention here disclosed relates to power transmitters for sewingmachines and the like. Objects of the invention are to provide atransmitter of simple construction, few parts and low .,cost,'which willnot require any special attention for servicing and which will be quietrunning and free .from vibration.

Particular objects of the invention are to provide the transmitter in aunit form of construction including clutch, brake and treadle lever,attachable as such to an electric motor or like power source.

Another special object of the invention is to provide a simple andeflicient vibration-free mounting for the motor which can be quickly andeasily attached to the work table or other support with which thetransmitter is to be used.

Another special object of the invention is to arrange the treadle leverso that a more nearly direct vertical pull may be applied thereto foreffecting control of the clutch and brake from theusual 'foot treadle.

A, Other desirable objects and the novel features of construction,combination and relation of parts through which the purposes of theinvention are attained are set forth or will appear in the course of thefollowing specification.

. The drawing accompanying and forming part l of the specificationillustrates a present comiinercial embodiment of the invention.Structure,

'however, may be modified and changed as regards the immediateillustration, all within the f true intent and scope of the invention ashereinf'after defined and claimed.

' Fig. 1 in the drawing is a broken and part sectional front elevationof one of the new power transmitters;

Fig. 2 is a broken end elevation of one of the resilient motor mounts;

Fig. 3 is a broken vertical sectional view as on substantially the planeof line 3-3 of Fig. 1;

Fig. 4 is a broken horizontal sectional view as on substantially theplane of line 44 of Fig. 3;

Fig. 5 is abroken sectional detail; and

Fig.6 is an end View of the thrust washer combined with one of thevibration damping cushions.

In Fig. 1 the transmitter is shown as comprising an electric motor 1equipped with a combination clutch and flywheel 8 cooperative with adriven clutch member 9 on shaft l6, having the Y pulley II for operatingthe sewing machine or 5 other mechanism.

Cooperation of the driven clutch element 9 with the driving clutchmember 8 or with the q stationary braking surface 52, is controlled inthe illustration by an angled treadle lever 53 pivotally supportedintermediate its ends at 54 and having a treadle pull rod 15 connectedwith the lower, laterally extending arm it of the same and having ashifting pin I! on the upper end of the upstanding arm I8 of the same inengagement with a bearing sleeve I9 for the driven shaft slidablymounted in a fixed bearing hub 20.

The motor may be of more or less standard construction but in particularit is shouldered at one end at 2! concentrically with the motor shaft22. Also, it is equipped with substantially concentric bearing hubs 23about the motor shaft.

The purpose of the shoulder 2| is to provide a concentric seat for thespecial end cap or hood 24 which forms a mounting or housing for theseveral power and braking elements of the transmitter.

Thus, this special end housing carries the stationary brake element 12,the hub 20' in which the bearing sleeve 59 is slidably mounted, thedependent bracket arms 25 between which the control lever is pivotallymounted and the anchorage 23 for the spring "2'5 which holds thehorizontal arm of the lever normally lifted with the movable clutchelement engaged with the stationary brake surface.

The assembly or attachment described may be handled and applied as suchover the shouldered end of the motor and secured through the medium ofthe bolts 28 usually employed for securing the frame sections of themotor together. This is made possible by the provision of specialsubstitute elongated screw studs 29 engaged over the ends of these boltsin place of the usual securing nuts and receiving at their outer endsthe screws 35 extended inward through the housing 24 in line with themotor frame bolts 28.

The motor is supported in a balanced, vibrationless, quiet, free-runningcondition, in the present invention, through the medium of resilientvibration damping cushions 3| about the bearing hubs 23 gripped in theends of a bracket or mounting yoke 32 secured at 33 to the underside ofthe table or other support 34, and having spaced, substantially parallelside arms 35, 36, arched about the ends of the motor. The inner one ofthese arms, 36, is shown as extending freely through a slot 38 in thetop of the cap or housing member 26 so as to avoid any transmission ofvibration from the housing member or motor to the supporting bracket.

The vibration damping cushions 3! are shown as gripped to the supportingarms 35, 36, of the mounting bracket 32 by means of encircling straps orlinks 39, 43, caught over projecting lugs M on the sides of the arms 35,36, and adjustably secured together at the bottom by clamping screws 42.The ends of the arms 35, 36, are indicated at 43, Fig. 2, as concaved at43 to accommodate the upper halves of the vibration damping cushions 3|so that with tightening of the strap closing screws 42 the cushions 6will be compressibly held in the ends of the mounting bracket.

The supporting of the motor by gripping it at opposite ends, concentricwith the shaft, balances and steadies the running of the motor and theresilient cushions insulate it against vibration in this balancedcondition so that the operation is quiet and smooth.

Quiet, free-running operation of the driven or pulley shaft I6 isassured, in the illustration, by journaling it in spaced ball bearingshown in Fig. i, as outer race rings 44 seated in opposite ends of thesliding bearing sleeve 59 and companion inner race rings 45 heldpositioned against the split rings G6 in grooves d? in the shaft by thethinned, inwardly spun. annular end flanges 48 of the bearing sleeve. Byengagement with the inner race rings the inturned flanges 48 close andpractically seal the ends of the bearing sleeve to hold lubricant andenable this double t bearing to continue in operation over long periodsof use without requiring any servicing or attention.

The shifting pin ll is shown as having a ball point it closely enteringa circular opening 56 in the side of the bearing sleeve to hold thebearing sleeve against rotative movement as well as to impart thedesired longitudinal shifting movements to the same.

To locate the .controllever It in position where :e

as nearly as possible vertical pull may be applied thereto, the pivotalmounting arms 25 are shown in Figs. 1 and .3 as ofiset forwardly of themotor axis, thus to bring the end of lever 13 more nearly over the planeof the foot treadle which is r.-

.connected with the pull link 15.

Figs, 3 and i show how the bearing shifting pin 9? extends rearwardlyfrom the upper end of the lever arm E3 in through an enlarged slot iiiin front of the stationary hub 26 in which the bearing sleeve isslidably supported.

In addition to the important advantages of quietness and smooth,free-running characteristics, the invention provides a particularlysimple and inexpensive form of construction which canbe readily combinedwith existing motor constructions.

While the yoke-shaped supporting bracket is shown engaged at itsopposite ends with opposite end portions of the motor, it iscontemplated that this yoke ma be lengthened to extend completely overthe motor and the power transmitter housing and be connected, throughthe vibration damping cushions, with the motor at one end and with thetransmitter housing at the opposite end.

To take up end thrust on the motor shaft occasioned by engagement of thedriven with the driving clutch element, there is provided in theillustration, a special clutch washer 52 about the motor shaft at theend of the right-hand bearing hub 23 secured non-rotatably in thisposition by means of extended and angularly bent lugs at diametricallyopposite points forced into or beneath the rubber or other resilientmaterial of the vibration damping ring or cushion 31 at that end of themotor. Between this and the face of the flywheel clutch element 8 asmaller, loose washer 54% may be introduced, as indicated in Fi 1.

The companion stationary and loose washers 52, 54, should be ofdifferent materials, such as steel for the larger, fixed washer 52, andbronze for the smaller, loose washer 54.

What is claimed is:

1. A transmitter of the character disclosed comprising a motor having aprojecting hub at one end, a resilient vibration damping cushion engagedabout said hub, a motor supporting bracket engaged with said cushion, athrust washer at the end of said hub and having an an-gularly extendedlug engaged with the material of said resilient vibration dampingcushion and thereby held against rotation, a driving clutch memberopposed to said thrust washer and a driven clutch element engageablewith said driving clutch member in a direction to thrust the lattertoward said stationarily held thrust washer, and a rotatable thrustmember interposed between said driving clutch element and stationarythrust washer.

2. A power transmitter as herein disclosed comprising an electric motorhaving a shaft carrying a driving clutch element, a housing secured overthe end of said motor and forming a unitary extension of the same, saidhousing having an elongated bearing in line with the motor shaft andprovided with a longitudinally extended slot in the side of the same, asleeve slidingl operable in said bearing and having an opening midlengthin line with the slot in said elongated hearing, ball bearings fixed inspaced relation in the opposite ends of said sleeve, a shaft journaledin said spaced ball bearings and rotatably held thereby so as to beshiftafole with said sleeve toward and away from said motor shaft, atransmission pulley on the outer end of said shiftable shaft, a drivenclutch element on the inner end of said shiftable shaft ccoperable withsaid driving clutch element on the inward movement of said bearingsleeve, braking surface on the interior of said housing opposed to saiddriven clutch element and engageable thereby on the outward shiftingmovement of said bearing sleeve, a bracket on said housing, a shiftlever pivotally supported on said bracket, a pin carried by said leverprojecting laterally through said slot in the elongated bearing intosaid opening in the slidable bearing sleeve, a spring connected withsaid lever for normally yieldingly holding the lever in position withthe sliding bearing sleeve in the outward shifting position, vibrationdamping cushions at opposite end portions of said motor and an invertedU-shaped supporting yoke arched over said opposite end portions of saidmotor and having its opposite ends connected with said cushions tothereby support said complete motor clutch-brake and shift lever as asingle unit in vibration damped relation.

PAUL SCHULDER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,560,123 Voigt Nov. 3, 19251,674,876 Thompson June 26, 1928 2,037,644 Voigt Apr. 14, 1936 2,057,370Dehlendorf et a1. Oct. 13, 1936 2,194,211 Sansom Mar. 19, 1940 2,208,513Katzman July 16, 1940

